Tir, tir or TIR may refer to:

• The modern Persian name for the Zoroastrian god Tishtrya
• Tir (month), of the Iranian calendar
• Tir (god), of ancient Armenia
• Tabar, Iran, a village in North Khorasan Province
• Old English spelling of the Norse god Týr
• Tir (demon), son of Iblis

Look up TIR, Tir, or tir in Wiktionary, the free dictionary.

• Total internal reflection
• Tigrinya language, ISO 639 code
• Tirupati Airport, IATA code
• Translocated intimin receptor, used by E. coli
• TIR Convention, (Transports Internationaux Routiers, International Road Transport)
• Toll-Interleukin receptor
• Total indicator reading in metrology

• Tir McDohl, in the video game Suikoden
• INS Tir, various ships of the Indian navy

• Tira (disambiguation)
• Tir Planitia, a large basin on Mercury
• Tír na nÓg, an Otherworld in Irish mythology

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